King Poseidon is the main antagonist of The SpongeBob Movie: Sponge on the Run and its adaptations, alongside being mentioned in SpongeBob's Director's Commentary, "SpongeHenge," "Nautical Novice," Squidward and the Golden Clarinet, "Accidents Will Happen," "High Sea Diving," and "Broken Alarm." He is the ruler of The Lost City of Atlantic City, has a golden clarinet, and is the namesake of both Poseidon Elementary School and the Poseidome Colosseum. His Roman counterpart is King Neptune.
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King Poseidon (True form)
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- He is voiced by Matt Berry, who also voices Bubbles the Dolphin from Sponge Out Of Water.